<template>
  <div class="todo-header">
          <input type="text" 
          placeholder="请输入你的任务名称，按回车键确认"
          v-model="title"
          @keyup.enter="add"
          />
  </div>
</template>

<script>
// 一个可以生成id的小插件
import {nanoid} from "nanoid"
export default {
    name:'MyHeader',
    data(){
      return {
        title:''
      }
    },
    // props:['addTodos'],
    methods:{
      add(){

        if(!this.title) return alert("输入值不允许为空")

        const todoObj = {
          id:nanoid(),
          title:this.title,
          completed:false
        }
        // 
        // this.addTodos(todoObj)
        this.$emit('addTodos',todoObj)
        this.title=''
      }
    }
}
</script>

<style scoped>
    /*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}

</style>